Apparatus for introducing air or gaseous fluid into the charge in rotary furnaces



April 16, 1929. G. BOJNER AL 1,709,456

APPARATUS FOR INTRODUCING AIR 0R GASEOUS FLUID INTO THE CHARGE IN ROTARY FURNACES Filed April 21, 1927 Patented Apr. 16, 1929;

UNITED STATES eusrav roman, or xan'nsran, AND ADAM HELMER rnnnson, or ermnnnnesnan,

PATENT OFFICE.

SWEDEN.

APPARATUS FOR INTBODUCIN G AIR OR GASEOUS FLUID INTO THE CHARGE I ROTARY FURNACES.

Application filed April 2 1, 1927, Serial Ila-185,635, and in Sweden AprilfM, 1926.

This invention relates to rotary furnaces and has for its chief object to provldetuyeres for such furnaces suitable for directing gaseous fluid through the charge therein when 5 t e latter is maintained at a comparatively "substantial depth and is even in a finely divided condition. y

According to the invention the furnace is provided with peripheral tuyeres formed by a series of inwardly extending members which are so constructed or arranged that each member overlaps or extends over the adjacent one to leave an openin for the passage of gaseous fluid through the fiiarge in the furnace. The said tuyeres may be formed by a series of radially arranged and inwardly extending plates each of which is provided with another plate projecting laterally therefrom and extending above and beyond the adjacent radial plate so that an opening for the passage of gaseous fluid is formed between the inner end of said adjacent plate and the outer surface of the latj erally extending-plate. Each of the laterally 1 extending plates may project from the radial f plate with which it is associated at a. point r 7 which is located between the innerand outer edges of such radial plate so that that part of the latter which extends inwardly beyond the laterally extending plate constitutes a ledge for obstructing the passage'of material into the tuyeres. By construction the t'uyeres in accordance with this invention it is possible amongst other advantages to satisfactorily treat a charge of material which is of a finel y divided nature as owing to the particular arrangementof the tu'yeres the charge is unable to enter the tuyeres and choke them but actually falls out of them during the rotation of the furnace.

In order that the said invention may be clearly understood and readily carried into effect the same will now be described more fully with reference to the accompanying drawings, in which Figure 1 is a vertical section taken throu h a. rotary furnace suitable for carrying out t e method, and

Figure 2 is a longitudinal section on the line '22 of Figure 1.

A A are the tuyeres which areof such a size as to be capable of receiving'a substantially large quantity of gaseous fluid which it is desired to pass through the material in the 'Each of the laterally extending membersproj sets from the radial member with which it is associated at a point which is located between the inner and outer edges of such radial member so that that part E'of the latter which extends inwardly beyond the laterally extending member constitutesa ledge for obstruct ing the passage of material into the tuycres during the rotation of the furnace. The

aforesaid openings D D in some cases may be covered by perforated plates through which the gaseousfluid enters the furnace. The

- gaseous fluid is admitted to the tuyeres A A by a distributing device or devices arranged either at one or both ends of the furnace or at a point between its ends. In theformer arrangement the said device or devices comprises a gas distributing head E secured to the stationary end plate F of the furnace.

The gaseous fluid may be caused to pass either, through the material in the furnace Into the spacemarked 1 above the material or in the opposite direction, that is to say, from the space 1 through the material in the furnace. In both cases the distributing head E is pro-' vided with side extensions G so that the gaseous fluid is conveyed through those tuyres A A around the lower part ofthe furnace which are at the time covered by the material in the furnace. In carrying out the invention variations may be made in whinh p d tion may be give to the variation in angles the different materials take in the furnace during the rotation and to the alterations which those may demand regarding distributing device or devices and other arrangements.

What we claim and desire to secure by Letters Patentof the-United States is 1. The combination with a rotary furnace of a plurality of peripheral tuyeres formed by a series of inwardly extending plates which-are so arranged that each plate overlaps the adjacent one to leave an opening for the passage of gaseous fluid through the charge in the furnace.

2. The combination with a rotary furnace of a plurality of peripheral 'tuyeres formed by a series of radially arranged and inwardly extending plates each of which is provided with a plate projecting laterally therefrom and extending above andebeyond the adjacent radial plate so that an opening for the passage of gaseous fluid is formed between the inner end of said adjacent plates and the outer surface of the laterally extending plate.

3. The combination with a rotary furnace of a plurality of peripheral tuyeres formed by a series of radially arranged and inwardly extending plates each of which is provided with a plateprojecting laterally therefrom and extending above and beyond the adjacent radial plate so that an opening for the passage of gaseous fluid is formed between. the inner end of said adj acont plates and the outer surface of the laterally extending plate it is associated at a point which is located between the inner and outer edges of said radially arranged plate so thatthat part of the latter which extends inwardly beyond the laterally extending plate constitutes a ledge for obstructing the passage of material into the tuyere. t

GUSTAV BOJNER. ADAM HELME R PEHRSON. 

